Vorbis dev - Mar 2003 - Some Questions

Hello 
I posted these to the vorbis maillist, but got no answers,
so I try it here again:

Currently, I'm having a
very close look at the spec and discovered some mistakes,
misundestandings:

1---------

in "vorbis-spec-res.html"
paragraph
Residue format
 Reside format partitions each.........
        ^ heres the 'u' missing.

<p>2--------------

Probably another one in vorbis-spec-floor1.html
at paragraph :
        packet decode
6) [class] = vector [floor1_partition_class]  element [i]
                          ^^^^^^^^^^^^^^^^^^^
is floor1_partition_class correct ? or should it be 
        floor1_partition_class_list

<p>3---------------
According to "vorbis-spec-ref.html"
paragraph: "mappings", the vector [vorbis_mapping_mux] 
should contain the following:
4.
if [vorbis_mapping_submaps] is greater than one, we read channel multiplex
settings.
For each [j] of [audio_channels] channels:
        1. vector [vorbis_mapping_mux] element [j] = read 4 bits as unsigned
integer
        2. if the value is greater than the highest numbered submap 
            ([vorbis_mapping_submaps] - 1), this in an error condition rendering
the stream undecodable

But, what are the values of vector [vorbis_mapping_mux] 
if [vorbis_mapping_submaps] is not greater than one? 

4--------------------------
Same file:
paragraph: "packet type, mode and window decode"
8. for [i] in range [right_window_start] ... [right_window_end]-1, 
        window([i]) = sin(.5 * PI * sin^2( ([i]-[right_window_start]+.5) /
[right_n] * .5 * PI/2. + .5 * PI) )
9. window from range [rigth_window_start] ... [n]-1 is zero 
                                   ^^^^^^^^^^^^^
This should be "right_window_end", otherwise it wouldn't make 
sense

5------------------------------
Again same file:
paragraph "floor curve decode"

 From this point on, we assume out decode context is using mode number
                                             ^^^
I think this should be "our" not "out".

6--------------------------------
File "vorbis-spec-ref.html"
paragraph "packet type, mode and window decode"

1. if this is a long window (the [vorbis_mode_blockflag] flag of this mode is
set):
        1. read 1 bit for [previous_window_flag]
        2. read 1 bit for [next_window_flag]
...

But how to set/unset them if [vorbis_mode_blockflag] flag of this mode is not
set?
(compiler complains about unitialized variables)

<p>Thank you
Dominik
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Dear, all

I haven't gone through all specifications of this project in detail. but it 
seems to me you are using Wavelet Transform as the basis of transform. If 
my impression was right, I got some questions about your project.

1) Wavelet Transform makes it very easy to code the scalability 
features...so I am wondering when you are developing this project, did 
Scalability come first ?..or just you want to improve the coding gain 
comparing with the conventional DCT basis Transform ??...

2) If the improvement of coding gain was the main objective of this 
project...Have you ever compared your project with H.264, which was 
technically approved by ITU...If you have, how did it come out ?

I'd really appreciate your reply.
Thanks.

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Dear, Stephen.

Oh..Really...I didn't know you developed DCT based codec...I went to the 
archive site of "Tarkin Project"...there was some discussion about
Wavelet
Transform...so I guessed Wavelet Transform was used for this 
project....Still....I would like to know how your project codec perform 
againt H.264 codec...If possible..

Thanks. 
>From: Stephen So <s.so@griffith.edu.au>
>Reply-To: vorbis-dev@xiph.org
>To: vorbis-dev@xiph.org
>Subject: Re: [vorbis-dev] Some Questions
>Date: Wed, 17 Mar 2004 21:09:29 +1000
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>
>The current Vorbis I encoder uses the MDCT. Wavelets are planned for the
>next generation of encoders (Vorbis II). :)
>
>Best regards,
>
>Steve.
>
>Kim Kyung-wook wrote:
>
> > Dear, all
> >
> > I haven't gone through all specifications of this project in
detail.
> > but it seems to me you are using Wavelet Transform as the basis of
> > transform. If my impression was right, I got some questions about your
> > project.
> >
> > 1) Wavelet Transform makes it very easy to code the scalability
> > features...so I am wondering when you are developing this project, did
> > Scalability come first ?..or just you want to improve the coding gain
> > comparing with the conventional DCT basis Transform ??...
> >
> > 2) If the improvement of coding gain was the main objective of this
> > project...Have you ever compared your project with H.264, which was
> > technically approved by ITU...If you have, how did it come out ?
> >
> > I'd really appreciate your reply.
> > Thanks.
> >
> > _________________________________________________________________
> > Ã¥»óÀ§¿¡ ´Ù¸® ¿Ã¸®°í ´À±ßÇÏ°Ô Áñ±ä´Ù... MSN ¿Â¶óÀÎ »ó¿µ°ü
> > http://vod.msn.co.kr
> > --- >8 ----
> > List archives: http://www.xiph.org/archives/
> > Ogg project homepage: http://www.xiph.org/ogg/
> > To unsubscribe from this list, send a message to
> > 'vorbis-dev-request@xiph.org'
> > containing only the word 'unsubscribe' in the body. No subject
is
needed.
> > Unsubscribe messages sent to the list will be ignored/filtered.
> >
>
>--
>--------------------------------------------------
>Stephen So, BEng(Hons)
>
>PhD Student,
>Signal Processing Laboratory,
>School of Microelectronic Engineering,
>Faculty of Engineering and Information Technology,
>Griffith University, Nathan Campus,
>Brisbane, QLD, Australia, 4111.
>
>Phone: +61-7-3875 3754
>E-mail: s.so@griffith.edu.au
>--------------------------------------------------
>
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